Can we migrate a live ataraid system to graid ?

[Jason Usher]

We created a few 8.3-RELEASE systems with boot mirrors using onboard Intel ICH10R.  The system picks up the mirror with "ataraid" and I see it in dmesg like this:

ar0: 114312MB <DDF RAID1> status: READY

But it seems that graid is a much better option, and ataraid has problems (I am seeing chatter on freebsd-fs and other places about problems).

Is it possible for us to migrate this boot mirror to graid ?  Can we just leave the mirror as-is (since it was bios formatted) and just start using graid ?

Has anyone done this switch on a live system, or is it impossible (and we need to reformat and start over) ?

Thanks.